40A AM32 Brushless Speed Controller

Price: 49.55 CAD

36.19 USD 30.89 EUR

In Stock: 69

• This 40A brushless speed controller will let you GO BIG with your next beetle-weight robot.
• These ESCs operate on new AM32 firmware, which is more efficient than BLHeli and has better spin-up routines giving you maximum power!
• Use it to drive our S2838 or F4006 weapon motors!

Description
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- This 40A brushless speed controller will let you GO BIG with your next beetle-weight robot.
- These ESCs operate on new AM32 programming, with our own customized firmware that provides amazing low-end control and torque compared to BLHeli!
- Use it to drive our S2838 or F4006 weapon motors!
- Reversing version available here: BL40A-AM32-R

Specifications:
Operates on FingerTech's optimized AM32 firmware
Voltage: 11.1V - 22.2V (3S-6S lipoly)
Current: 40A continuous, 45A burst (<10 seconds)

Size: 37 x 12.4 x 6.5mm (1.5 x 0.49 x 0.26in).
Weight: 12.1grams (0.43oz)
Motor wires: 3.5mm female bullet connectors, 8cm (3.15in) wire length.

Note:
- No on-board BEC. Must provide 5V to radio receiver via other ESCs or separate dedicated BEC.
- Wiring: Connect the three motor wires any way you like. If the motor is spinning backwards, swap any two wires.

1 Product Reviews - Average rating 5 / 5 (Show All)

Love the simplicity of AM32!

Max Luu, The RoboDome - 04th March 2026

I used this 40A ESC on my newest beetleweight (3lb) robot, Fever Dream, for its weapon motor using the 1100kV JCR RDY-MINI-4022-V2 Hubmotor with a 0.2" JCR Promo blade. I updated the settings on this ESC using a USB AM32 programmer (super easy) with the kV rating on my motor and it worked like a charm! I also experimented and found that you can re-program this ESC to be reversible in a pinch.

Anecdotally, the spin-up felt faster and more reliable than the equivalent BLHeli32 version that I run on my other 3lb bot. Your mileage may vary depending on your ESC's configuration. I spent a good amount of time playing with the AM32 settings on this ESC to try to optimize and that worked out very well.

F4006-740KV Brushless Outrunner - 59.46 CAD

• Are you looking for a motor that can handle absurdly large blades without breaking a sweat? Introducing our new F4006 740KV Brushless Outrunner!

• This is our most powerful motor yet! It can run on 2-4S batteries, and draw up to 40A.

• Don't let its shockingly low profile of only 20mm fool you, this motor can dish out a serious beating with a thick 4mm shaft.

• Easily drive this motor with our new 40A AM32 brushless esc.

FingerTech S2838 Brushless Inrunner 2970KV - 40.54 CAD

• This Brushless Inrunner is what we use in the Beater Bar Electronics. Its size and power make it ideal for beetleweight robot weapons (and aggressively ambitious for antweight weapons!)

• With an inrunner, you don't have to worry about wires getting caught by a spinning outer can.

5V 4A Switching UBEC Regulator - 9.91 CAD

• Does your receiver have telemetry, requiring more power than small ESCs provide?
• Are you running brushless drive whose ESCs have no 5V return line to the receiver?
• This voltage regulator will supply 5V at up to 4A from any battery 6-23V (2S-6S lipoly).

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40A AM32 Brushless Speed Controller